watasi ha neru mae ni sumaho wo misuginai you ni site imasu.

Yes, 私 can often be omitted in Japanese if the subject is clear from context.

So:

• 私は寝る前にスマホを見すぎないようにしています。
• 寝る前にスマホを見すぎないようにしています。

Both can work.

Including 私は can:

• make the topic explicit,
• add contrast, or
• help in textbook/example sentences.

In natural conversation, Japanese speakers often leave it out unless they need to emphasize as for me.

は marks the topic of the sentence.

In 私は寝る前にスマホを見すぎないようにしています, 私は means something like:

• As for me, ...
• I, for my part, ...

It does not work exactly like the English subject marker every time, but in this sentence it introduces what the speaker is talking about.

Because when a verb directly modifies a noun in Japanese, you use the plain form, not the polite ます-form.

Here, 前 is a noun meaning before, and 寝る modifies it:

• 寝る前 = before sleeping / before I sleep

This is the same pattern as:

• 食べる時間 = time to eat
• 行く場所 = place to go
• 起きる前 = before waking up

So 寝る前 is the correct grammar.

前 means before, and に marks the time point.

So:

• 寝る前に = before sleeping / before going to bed

The pattern is:

• dictionary-form verb + 前に

Examples:

• 食べる前に手を洗う。 = I wash my hands before eating.
• 寝る前に本を読む。 = I read a book before sleeping.

In this sentence, に marks the time when the main action happens relative to another event.

• 寝る前に = at the time before sleeping

It helps connect the time expression to the main action:

• 寝る前に → before going to bed
• スマホを見すぎないようにしています → I try not to look at my phone too much

You will often see 前に as a fixed pattern.

In Japanese, スマホを見る literally means to look at one’s smartphone, and that is a very natural way to express checking, watching, or looking at your phone.

English often says:

• use my phone
• be on my phone
• look at my phone

Japanese commonly uses 見る for this idea.

So スマホを見る is perfectly natural.

見すぎない is built like this:

• 見る = to look
• 見すぎる = to look too much / overdo looking
• 見すぎない = to not look too much

The grammar point is verb stem + すぎる, which means to do too much.

Examples:

• 食べすぎる = eat too much
• 飲みすぎる = drink too much
• 使いすぎる = use too much
• 見すぎる = watch/look too much

Then make it negative:

• 見すぎない = don’t look too much

Because すぎる attaches to the verb stem, not to a negative form.

Correct formation:

• 見る → stem 見
• 見すぎる = look too much
• 見すぎない = not look too much

Not correct:

• 見ないすぎる

So the order is:

1. make too much form with すぎる
2. if needed, make that whole verb negative

ようにする often means:

• to make an effort to...
• to try to...
• to make it a habit to...

In this sentence:

• 見すぎないようにする
• to try not to look at it too much
• to make a habit of not overchecking it

It expresses an intentional effort, not just a simple fact.

Compare:

• スマホを見すぎない。 = I do not look at my phone too much.
• スマホを見すぎないようにしている。 = I try not to look at my phone too much.

The second one suggests conscious self-control.

Because ようにする is a set grammar pattern.

In this sentence:

• 見すぎないようにする

Here, ように roughly means so that or in such a way that.

So the whole phrase means:

• to do things so that I don’t look at my phone too much
• more naturally, to try not to look at my phone too much

You do not usually translate each part literally in normal English; it is better to learn verb-negative + ようにする as a common pattern.

～ようにしています means the speaker is making a continuing effort or maintaining a habit.

So:

• 見すぎないようにします can sound like:

  • I’ll try not to...
  • I make it a point not to...
    depending on context

• 見すぎないようにしています means:

  • I am trying not to...
  • I make a habit of not...
  • I’ve been trying not to...

The ている form here shows an ongoing state or repeated habit, not necessarily an action happening right this second.

Usually it describes a general habit or ongoing effort.

So this sentence most naturally means something like:

• I try not to look at my phone too much before bed.
• I make a point of not overchecking my phone before sleeping.

It does not usually mean only right now, at this moment.

Yes, but it would change the structure and nuance.

• 寝る前にスマホを見すぎないようにしています。

  • Before bed, I try not to look at my phone too much.
  • Here 寝る前に works as a time expression.

• 寝る前はスマホを見すぎないようにしています。

  • As for before bed, I try not to look at my phone too much.
  • This gives before bed more of a topical or contrastive feel.

The に version is more straightforward and probably the most natural here.

Yes, but the meaning changes.

• 見ないようにしています = I try not to look at my phone (at all).

• 見すぎないようにしています = I try not to look at my phone too much.

So the original sentence is softer and more realistic: the speaker may still look at their phone, but tries not to overdo it.

Yes. It is polite overall because it ends with しています.

The sentence mixes:

• plain forms inside grammar structures:
  • 寝る
  • 見すぎない
• with a polite final verb:
  • しています

This is completely normal in Japanese. The plain forms appear because they are required inside patterns like:

• 寝る前
• 見すぎないようにする

The politeness of the sentence is mainly shown at the end.

A helpful breakdown is:

• 私は = as for me
• 寝る前に = before going to bed
• スマホを = smartphone + object marker
• 見すぎない = not look at it too much
• ようにしています = am trying to make that my habit / make an effort to do that

So the structure is basically:

[topic] + [time expression] + [object] + [negative goal] + ようにしている

In simpler grammar terms:

I + before bed + phone + not too much look + try/do habitually

Which becomes natural English as: I try not to look at my phone too much before bed.